What, milky way has balls?

First there were blackholes and hair, and now there are blackholes and balls. .. or blackholes with bubbles…

I am not surprised as this. Milky way is a thin disk and in the perpendicular direction there is something going on… May be thats what keeps the disk so thin!

Above is a cartoon picture to summarize the observations of the Fermi bubble structures. Two blue bubbles symmetric to the
Galactic disk indicate the geometry of the gamma-ray bubbles observed by the Fermi -LAT. Morphologically, we see corresponding features
in ROSAT soft X-ray maps, shown as green arcs embracing the bubbles. The WMAP haze shares the same edges as the Fermi bubbles
(the pink egg inside the blue bubbles) with smaller extension in latitude. These related structures may have the same physical origin: past
AGN activities or a nuclear starburst in the GC (the yellow star).

Actual pictures are like watching a poor ultrasound and trying to figure out the features.